Method of loading detonating-caps



T'. WENNERSTHM.

METHOD 0F vLOADING DHTONATING CAPS.

APPLICATION FILED APH. 15| 1919-;

Patented Sept.` 13, 1921.

Inwn'wz: l

PMENTl OFFICE.

TORSTEN WENNERSTRM, 0F BOFORS,

METHOD OF LOADING DETONATING-CAPS.

Specication olf Letters Patent.

Application led April 15, 19'19.- Serial No. 250,319.

To all whom it may concern:

Be it known that I, ToRs'rnN WENNER- sTRM, a subject of the King ofSweden, residing at Bofors, Sweden, have invented new and usefulImprovements in Methods of Loading Detonating-Caps, of which thefollowing 1s a specification.

Detonating caps for dynamite hitherto usually have been loaded in such amanner that the detonating. composition after the introduction in thecap is submitted to pressure by means of a pressing die introduced inthe mouth of the cap. When such a loading of 'caps with a main loadingor trotyle (trinitro-toluol) or the like and an initial or primaryloading of fulminatirg mercury or the like has taken place hitherto atleast three pressing operationshave been required viz. one fbr thecompression of the main loading, one for the compression of the initialloading in its preserving cap and one for the introduction of the caplast mentioned in the outer or detonating cap, filled with the mainloading. Hereby the main loading evidently will obtain the least degreeof compression at the bottom of the outer cap and the largest one'at'the cap, in-

` closing the primary loading, whereby the variation of its densitybecomes the most unsuitable one for the releasing and the course of thedetonating process.

My invention has for its object to avoid this inconvenience by providinga method whereby the pressing operation is carried out from the bottomof the detonating cap (which for this purpose is open in both endsV asalready known), in such a manner that, after the'introduction oftheempty cap for the initial loading on its place in the outer cap throughthe said bottom, this initial loading cap is loaded with the initialloading, whereupon the main loading is introduced in the outer cap andthe whole' o .pressing operation is diminished to a minicontents of thetwo caps finally is submitted to pressure from the bottom end. Thepressure hereby `is applied directly upon the non-sensitive main loadingand'not as heretofore upon the sensitive '.itial loading. In the loadingof larger dynamite detonating caps a subsequent filling with mainloading and a further compression in some` cases is necessary.

In the accompanying drawing the herein described method of loading isillustrated,

in which drawing,

Figures 1 to 3 are vertical longitudinal sections of a portion of aloading frame illustrating theca before the filling, after the filling,and agter the pressing respectively.

Fig. 4 is a rlongitudinal section of the filledl detonating cap.

In Fig. 1 is shown an empty cap 1 open at both ends, and inserted in theloading frame a, of which only the parts adjacent to the cap are shown.The frame is provided with a removable bottom o having upstanding pins bwhich project through channels formed in the frame a. A cap 2 forreceiving the initial loading is inserted in the cap 1 as shown inFig. 1. In Fig. 2 the cap is illustrated as having received the initialloading 4, and the main loading 3, in the initial loading cap 2, theouter cap l, respectively, while Fig. 3 illustrates the osition oftheseloadings after pressure rom the bottom end of the cap 1.l Fig. 4,as hereinbefore stated, illustrates the cap after it has been loaded andpressed and removed from the loading frame.

By the method now described the following advantages are obtained:

1. The detonating cap is loaded by only one pressing operation 1n placeof by three such ones.

2. `The main loading obtains its least density near to the initialloading and its largest density at ,the opposite end of the outer cap,which as above mentioned is of a great importance for an advantageousreleasing and course of the detonation.

3. The primary cap can obtain a greater length than heretofore, so thatits mouth eX- tends longer in the main loading than heretofore, wherebyit gets a better hold, so that a good detonation is obtained andaccidents are obviated.-

4. The danger of an explosion during the mum, as the pressure is appliedto the nonsensitive main loading and the cap inclosing thesensitiveinitial loading cannot be displaced during the pressing operation,because it has been inserted on its place already before its fillingwith the initial loading and the pressing operation. l 5. There is norisk of stickingv of dust from the sensitive initial loading upon theinside of the outer'I cap or the pressing means.

Patented Sept. 13, 1921.

Havin now @rticularly described the nature o my invention andthe mannerof its operation, what I claim is:

1. An improved method of loading detonating caps open at both endsthereof, which consists in inserting a cap Within said open-ended cap,introducing an initial loading into said inner cap, introducing into theopen-ended'cap a main loading through its open' bottom and subjectingthe Whole contents of the two caps to pressure in a single operation.

2. An improved method ofloading detonating caps open at both endsthereof, which consists 1 in insertin a cap within said open-ended cap,intro ucing an initial loading into said inner cap,'ntroducing into theopen-ended cap a main-loading through its open bottom, subjecting thewhole c ontents of the vtWo caps to pressure in a single operation,introducing-again a main loading through the open bottom and finallysubjecting the contents again to pressure.

In 'testimony whereof I have signed my name to this speciication.

TORSTEN WENNERSTRM.

